What if alignments were a continuum and not mutually exclusive?

[Duff]

You actually have 2 different concepts in there:
Scoring alignment - Where PC actions generate a numeric total that matters (for detects, effects and/or afterlife). It's adding a new thing to remember, so as a table you need to have enough buy in, or else you're going to realise it's months since you remembered to note down a score for an action. If it's worth it too you, great. But that means those points [B]matter[B]. You're running a setting or game where a character's connections to alignment are a defining feature.

Relative alignment can be done descriptively. The detects are then a little more informative
"Detect alignment shows this character quite often performs both good and evil acts". "This character rarely performs good acts but does some evil"

Or, more interestingly, detect good and detect evil only show a character's connection to the respective plane. "This character often performs good acts" without giving any hint that they work for Kitten Squishers Incorporated